Olympiad Test: Pollution Of Air And Water - 2


18 Questions MCQ Test Science Olympiad Class 8 | Olympiad Test: Pollution Of Air And Water - 2


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Attempt Olympiad Test: Pollution Of Air And Water - 2 | 18 questions in 30 minutes | Mock test for Class 8 preparation | Free important questions MCQ to study Science Olympiad Class 8 for Class 8 Exam | Download free PDF with solutions
QUESTION: 1

CFCs are compounds used in

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QUESTION: 2

Other than CO2 which of these contribute towards the green house effect?

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QUESTION: 3

Several countries have signed ______ protocol to reduce the emission of green house gases to conserve ozone layer from getting depleted in the atmosphere.

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QUESTION: 4

Which one of these causes is not a man-made pollution?

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QUESTION: 5

Which of the following are used in electric water filters to kill all the harmful micro-organisms present in tap water and make it absolutely safe for driving?  

Solution:

Ultraviolet radiations kill bacteria and viruses and are used in electric water filters to make water safe for drinking.

QUESTION: 6

Volcanic eruption is a natural cause of air pollution.

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QUESTION: 7

Global warming can be reduced by

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QUESTION: 8

Which of the following will reach the earth in greater amounts if the amount of chloroflouro carbons released into the air increases      

Solution:

Chlorofluorocarbons used in refrigerators, air conditioners and aerosol sprays are responsible to deplete the ozone layer in the atmosphere. Ozone layer protects us from harmful ultraviolet rays of the sun. 

QUESTION: 9

Which disease can be possible due to drinking of polluted water?

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QUESTION: 10

Corrosion of marble is also called

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QUESTION: 11

Which of these gases is present in highest percentage in air?

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QUESTION: 12

Sculptures/monuments and buildings are destroyed by

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QUESTION: 13

Biological pollution in water is caused by  

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QUESTION: 14

A substance used for disinfecting water is

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QUESTION: 15

The ozone layer in our atmosphere protects us from the harmful effects of ultra violet rays which can cause

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QUESTION: 16

Which of these are causes of air pollution?

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QUESTION: 17

Which of these metals is/are found generally in the contaminated water bodies?

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QUESTION: 18

Chlorination of water is done

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